EP2935161A1 - Procédé et unité de production d'oléfines - Google Patents

Procédé et unité de production d'oléfines

Info

Publication number
EP2935161A1
EP2935161A1 EP13799302.8A EP13799302A EP2935161A1 EP 2935161 A1 EP2935161 A1 EP 2935161A1 EP 13799302 A EP13799302 A EP 13799302A EP 2935161 A1 EP2935161 A1 EP 2935161A1
Authority
EP
European Patent Office
Prior art keywords
methanol
fraction
distillation
stream containing
separating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13799302.8A
Other languages
German (de)
English (en)
Other versions
EP2935161B1 (fr
Inventor
Martin Rothaemel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Publication of EP2935161A1 publication Critical patent/EP2935161A1/fr
Application granted granted Critical
Publication of EP2935161B1 publication Critical patent/EP2935161B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C7/00—Purification; Separation; Use of additives
    • C07C7/04—Purification; Separation; Use of additives by distillation
    • C07C7/05—Purification; Separation; Use of additives by distillation with the aid of auxiliary compounds
    • C07C7/08—Purification; Separation; Use of additives by distillation with the aid of auxiliary compounds by extractive distillation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/009—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping in combination with chemical reactions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/14—Fractional distillation or use of a fractionation or rectification column
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/14—Fractional distillation or use of a fractionation or rectification column
    • B01D3/143—Fractional distillation or use of a fractionation or rectification column by two or more of a fractionation, separation or rectification step
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/34—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping with one or more auxiliary substances
    • B01D3/40—Extractive distillation
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C1/00—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon
    • C07C1/20—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon starting from organic compounds containing only oxygen atoms as heteroatoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2521/00—Catalysts comprising the elements, oxides or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium or hafnium
    • C07C2521/02—Boron or aluminium; Oxides or hydroxides thereof
    • C07C2521/04—Alumina
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2529/00—Catalysts comprising molecular sieves
    • C07C2529/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites, pillared clays
    • C07C2529/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • C07C2529/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11

Definitions

  • the present invention relates to the production of olefins, in particular propylene.
  • Propene (C3H6) is one of the most important starting substances of the chemical industry.
  • the demand for the base material propylene is increasing worldwide, wherein propylene just like ethylene mostly is produced from petroleum in a steam cracker in a ratio dependent on the process and the raw materials.
  • the oxygenates are separated from the water contained in the stream, wherein the oxygenate-containing stream subsequently can be recirculated into the reactor.
  • This concept has the disadvantage that directly subsequent to the reactor quenching is effected, i.e. the product stream coming from the reactor is cooled by adding water. The water content in the product stream is distinctly increased thereby.
  • the high water contents which are present in both columns due to the proposed separation concept lead to the fact that here as well very large amounts of energy are required for the purification, so that with an energy balance over the entire process the savings in the field of methanol purification hardly produce any effect or not at all.
  • the process for producing olefins from oxygenates comprises the following steps:
  • a partial stream of the methanol used as educt for the catalytic conversion is branched off and introduced into the distillation for separating a stream containing the C 4+ fraction and dimethyl ether (process step (iii)).
  • This interconnection provides for both separating C 4 components from water and in parallel withdrawing a very pure methanol at one side draw in one and the same column, which methanol then is used as extracting agent in process step (ii). Due to this combination, the otherwise necessary purification of the methanol by three columns can be omitted, as a part of the methanol purification can also be performed in step (iii). In addition, the use of an externally supplied, possibly contaminated auxiliary substance for the extraction can be omitted.
  • the separated aqueous stream containing methanol from process step (iii) is subjected to a purification, so that the methanol and the water fraction are separated from each other.
  • the purified methanol is supplied to the heterogeneously catalyzed conversion in the reactor, whereby the conversion can be increased.
  • a further increase of the yield of the desired product propylene is obtained in that the stream containing C 4+ and dimethyl ether from process step (iii) likewise is supplied to the heterogeneously catalyzed conversion.
  • the dimethyl ether is at least partly converted to olefins, while the longer-chain olefins for the most part are converted to propylene.
  • the process according to the invention can be carried out with methanol with a very high degree of purity, preferably degree AA, but is particularly effective when as educt methanol with a degree of purity of less than 99.8 wt-% (based on contained oxygenates, excluding the water content) is used, as the expensive methanol purification with a plurality of columns thus can be saved.
  • a purification in only one distillation column usually will be effected, and the methanol then will directly be fed into the MTP reactor.
  • the invention furthermore also comprises a plant with the feature of claim 10, which is suitable for carrying out the process with the features of claims 1 to 9.
  • the plant for the production of olefins from oxygenates comprises a reactor for the heterogeneously catalyzed conversion of methanol to a stream containing a C3- and a C 4+ fraction, a distillation column for separating the C3 fraction from a bottom product, and a distillation column for separating a stream containing the C 4+ fraction and dimethyl ether from a stream containing water and methanol from the bottom product. Due to the novel purification, it is possible with this plant to also use methanol with a lower degree of purity, without the resulting product spectrum being shifted towards higher olefins or a higher energy demand being obtained.
  • the distillation column for separating the C3- fraction and/or the distillation column for separating a stream containing the C 4+ fraction and dimethyl ether is a column for the extractive distillation.
  • the separation efficiency of the respective column can distinctly be increased thereby.
  • the column for separating a stream containing the C 4- fraction and dimethyl ether from a stream containing water and methanol includes a side draw by means of which methanol, preferably with a degree of purity of less than 0.1 wt-%, water, preferably less than 0.05 wt-% water, particularly preferably less than 0.01 wt-% water can be withdrawn. It hence is possible that the extracting agent required in the column for separating the C3- fraction is obtained within the column for separating a stream con- taining the C 4- fraction and dimethyl ether. Further features, advantages and possible applications of the invention can be taken from the following description of the drawings and the example. All features described and/or illustrated form the subject-matter of the invention per se or in any combination, independent of their inclusion in the claims or their back- references.
  • Fig. 1 schematically shows a usual MTP process
  • Fig. 2 schematically shows the MTP process according to the invention.
  • the methanol subsequently gets into the MTP reactor 12, where it is converted to olefins.
  • the conversion inside the reactor is effected in an adiabatically operated dimethyl ether pre-stage, where the methanol is converted to dimethyl ether and water by using a highly active and highly selective alumina catalyst.
  • the stream consisting of methanol, water and dimethyl ether then is supplied to the actual MTP reactor stage and mixed there with steam, wherein conversions of methanol and dimethyl ether of up to 99% can be achieved when using a suitable zeolite-based catalyst.
  • the reaction also can be carried out in a single stage on a zeolite catalyst, preferably on a catalyst of the type ZSM-5. As occurring gross reaction equation, the following two main reactions take place:
  • the entire product stream obtained subsequently is cooled and compressed and the gaseous fraction is supplied to a first separating means 20.
  • the same preferably is operated as extractive distillation, wherein methanol is used as extracting agent.
  • This methanol is branched off from the educt inflow 10 and introduced into the separating means 20 via conduit 14.
  • the C3- fraction is withdrawn over the head of the separating means 20.
  • the remaining bottom product which contains the C 4+ fraction, methanol, dimethyl ether and water, is supplied via conduit 22 to a suitable extraction apparatus, e.g. a mixer-settler system 23, 26.
  • the mixer 23 water is added in addition and mixed with the bottom product of the column 20. Via conduit 25, this mixture is supplied to the settler 26 in which the organic phase separates from the aqueous phase. Via conduit 27, the organic stream substantially containing the C 4+ fraction thus can be obtained, wherein the same can be recirculated into the reactor 12 via a non- illustrated conduit, in order to there convert the higher olefins to the desired target product propylene. Via conduit 28, the aqueous stream which also contains the oxygenates, above all dimethyl ether and methanol, is withdrawn. This stream must be subjected to a further purification. To increase the yield, it is recommendable to likewise guide the purified methanol and the dimethyl ether back into the reactor 12.
  • the reaction product obtained is supplied via conduit 1 13 to a separating device 120 in which the target product, the C3- frac- tion, is withdrawn over head.
  • the bottom product consisting of the C 4+ fraction, methanol, dimethyl ether and water is supplied to the separating means 123.
  • the separating means 123 also is a distillation column. In this distillation col- umn, the C 4+ fraction, dimethyl ether and in part also methanol, is withdrawn over head. Via a non-illustrated conduit, this top product can be recirculated into the reactor 1 12. In the reactor 1 12, the higher olefins for the most part are converted to olefins with shorter chain length, whereby the yield of propylene can be increased further. The recirculated dimethyl ether likewise is available for the conversion to olefins. The possibly contained methanol is the educt of the reaction and correspondingly is converted in the reactor 1 12. Such interconnection of the separating means is possible due to the invention, since the changed concept allows to also use recirculation streams with a lower degree of purity, so that here the dimethyl ether and methanol can be recycled together with the C 4+ fraction.
  • the following example shows the composition of the streams when using the process according to the invention, as it is shown in Fig. 2.
  • the mass flow rate is 1000 kg/h.
  • the two columns 120 and 123 have the following specifications:
  • Column 120 has 30 trays and a reflux ratio of 4.6.
  • the draw of the bottom prod- uct is effected in tray 15, the feeding of the extracting agent methanol in tray 2, wherein the trays each are to be counted from the top.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Cette invention concerne un procédé de production d'oléfines à partir d'oxygénats, comprenant les étapes suivantes : (i) conversion catalysée de manière hétérogène du méthanol en un flux de produit contenant une fraction C3- et C4+, (ii) distillation du flux de produit pour séparer la fraction C3- d'un produit de queues, et (iii) distillation du produit de queues pour séparer un flux contenant la fraction C4+ et de l'éther diméthylique d'un flux contenant de l'eau et du méthanol. De plus, une unité de production pour la mise en œuvre du procédé selon l'invention est en outre décrite.
EP13799302.8A 2012-12-21 2013-12-03 Procédé et unité de production d'oléfines Active EP2935161B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012112840.5A DE102012112840A1 (de) 2012-12-21 2012-12-21 Verfahren und Anlage zur Herstellung von Olefinen
PCT/EP2013/075439 WO2014095358A1 (fr) 2012-12-21 2013-12-03 Procédé et unité de production d'oléfines

Publications (2)

Publication Number Publication Date
EP2935161A1 true EP2935161A1 (fr) 2015-10-28
EP2935161B1 EP2935161B1 (fr) 2019-05-15

Family

ID=49709675

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13799302.8A Active EP2935161B1 (fr) 2012-12-21 2013-12-03 Procédé et unité de production d'oléfines

Country Status (5)

Country Link
US (1) US9932281B2 (fr)
EP (1) EP2935161B1 (fr)
CN (1) CN104837791B (fr)
DE (1) DE102012112840A1 (fr)
WO (1) WO2014095358A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110452087B (zh) * 2018-05-08 2022-02-01 中国石油化工股份有限公司 低碳烯烃的生产方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4709113A (en) 1987-04-29 1987-11-24 Mobil Oil Corporation Conversion of crude methanol to gasoline with extraction
DE10027159A1 (de) * 2000-05-31 2001-12-13 Mg Technologies Ag Verfahren zum Erzeugen von Propylen aus Methanol
US7241716B2 (en) 2003-11-10 2007-07-10 Exxonmobil Chemical Patents Inc. Protecting catalytic sites of metalloaluminophosphate molecular sieves
US7879920B2 (en) 2004-12-22 2011-02-01 Exxonmobil Chemical Patents Inc. Oxygenate to olefin manufacture and recovery process
DE102005048931B8 (de) 2005-10-13 2015-06-18 Air Liquide Global E&C Solutions Germany Gmbh Verfahren und Anlage zur Herstellung von C2-C4-Olefinen aus Methanol und/oder Dimethylether
US8395008B2 (en) * 2008-01-14 2013-03-12 Catalytic Distillation Technologies Process and catalyst for cracking of ethers and alcohols
DE102011014892A1 (de) * 2011-03-23 2012-09-27 Lurgi Gmbh Verfahren und Anlage zur Herstellung von niedermolekularen Olefinen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2014095358A1 *

Also Published As

Publication number Publication date
WO2014095358A1 (fr) 2014-06-26
EP2935161B1 (fr) 2019-05-15
US20150353450A1 (en) 2015-12-10
US9932281B2 (en) 2018-04-03
CN104837791B (zh) 2018-02-06
DE102012112840A1 (de) 2014-06-26
CN104837791A (zh) 2015-08-12

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